The 25-year-old opted to quit the Ricoh Arena as a free agent after his current three-year-deal expired last week.
"I wanted to see what was offered, but I have always wanted to stay in the Championship," he told the Coventry Telegraph.
"Obviously I like it at Coventry but I don't feel it is right for me at this time and I'm going to look elsewhere.
"I'm grateful to the club for everything it has done for me over the last three years. I've had a great time, but I think it's time for me to look for another club.
"The fans have been great with me, as have all the managers I've worked with. I've played in a few positions and this is the first time I have played week in, week out in a settled position and I'm grateful for that."